lml@lancaironline.net Mailing List Archive

Fred,

Thanks for supplying the Columbia wiring diagram; very interesting. Schottky diodes are definitely the way to go. Something like a MBRB4030 might work well in this application, for 12V systems. You can order them on-line through Digi-Key, and I'm sure other suppliers. The MBRB4030 will handle up to 40A with only a 0.55V drop. Don't forget to heatsink the diode as 40A at 0.55V is 22W. Higher currents and voltages are available. Try the ON Semiconductor (http://www.onsemi.com/PowerSolutions/parametrics.do?id=815) and International Rectifier (http://www.irf.com/product-info/diodes/) websites.

Tom Gourley

----- Original Message -----

From: Fred Moreno

To: Lancair Mailing List

Sent: Thursday, August 24, 2006 10:37 AM

Subject: [LML] Dual bus architecture

If you want to see an FAA-approved electrical system for an all-electric airplane, see the Columbia operator’s manual, available from Columbia Aircraft on line. To save you the search, I printed, scanned, and attached the appropriate page. There is a lot of wisdom embedded in this comparatively simple diagram. When you see those big diodes, think of the low voltage drop Shotky diodes from Perehelion Designs. “PFD” means “primary flight display.

Fred Moreno

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